component
FM4258
Public Made by Adomby adom
Shenzhen Fuman Battery Management, ESOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownFM4258
Shenzhen Fuman · Battery Management · ESOP-8
FM4258 from Shenzhen Fuman, in a ESOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VIN | power_in | Chip supply input, with a recommended range of 4.6 V to 5.5 V, an operating range of 3.6 V to 7.0 V, and an absolute maximum of 8.0 V with no signal applied. |
| 2 | AGND | power_in | Analog ground, which must be connected together with the power ground PGND. |
| 3 | SW | input | Switch node connected to the inductor; the trace should be kept as short as possible to reduce EMI. |
| 4 | VBS | power_out | Boost converter output, with the C5 capacitor placed close to this pin in the typical application circuit. |
| 5 | BAT | power_in | Battery positive connection; the float charge voltage is 8.5 V (8.45 V to 8.55 V) and the battery overvoltage protection voltage is 8.90 V. |
| 6 | ISET | input | Charge current control pin; a resistor from ISET to GND sets the constant-current charge level, with the ISET constant-current clamp voltage at 1 V. |
| 7 | EN | input | Multiplexed VIN voltage detection and shutdown pin; EN below 1.2 V limits the charge current through the adaptive input loop, and EN below 0.3 V shuts the chip down. |
| 8 | LED | output | Charge status indicator output, which stays on during charging, turns off when charging is complete, and blinks at 1 Hz on input/output overvoltage, output undervoltage or short circuit, over-temperature, or no battery. |
| 9 | PGND | power_in | Power ground on the exposed thermal pad, which must be soldered reliably and connected to a large copper ground area for heat dissipation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen Fuman |
| Package | ESOP-8 |
| Category | Power Management (PMIC) |
| Pins | 9 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| 电源电压 (VIN) | VIN | 3.6 | 7 | V | 4 | ||
| 充电浮充电压 | VCV | 8.45 | 8.5 | 8.55 | V | 4 | |
| BLOCK PMOS 导通阻抗 | RPFET | 90 | 138 | mΩ | 4 | ||
| 无信号输入时供电电源 | VIN | 8 | V | 3 | |||
| 结工作温度范围 | TJ | -40 | 150 | ℃ | 3 | ||
| 存储温度范围 | TSTG | -65 | 150 | ℃ | 3 | ||
| 引脚温度（焊接） | TSDR | 260 | ℃ | 焊接 10 秒 | 3 | ||
| 输入电压 | VIN | 4.6 | 5.5 | V | 3 | ||
| 环境温度 | TA | -40 | 85 | ℃ | 3 | ||
| 结温范围 | TJ | -40 | 125 | ℃ | 3 | ||
| 电源欠压保护阈值电压 | VUVLO | 3.35 | V | VIN 下降，EN 恒高 | 4 | ||
| 电源欠压保护迟滞 | VUVLO | 100 | mV | 4 | |||
| 电源过压保护阈值电压 | VOVP | 6.6 | V | VIN 上升保护后下降 | 4 | ||
| 电压过压保护迟滞 | VOVP | 400 | mV | 4 | |||
| 芯片静态电流 | IDD | 311 | uA | 无电池 | 4 | ||
| 芯片关断电流 | ISD | 6 | uA | VBAT > VIN | 4 | ||
| 电池漏电电流 | IBAT | 30 | uA | 充电完成 | 4 | ||
| 电池漏电电流 | IBAT | 4 | uA | 关断芯片 VBAT = 8.5V | 4 | ||
| 电池漏电电流 | IBAT | 0.1 | uA | VIN = 0V | 4 | ||
| Recharge 电压 | VRCH | 8.3 | V | 4 | |||
| 涓流截止电压 | VTRK | 5.6 | V | 4 | |||
| 电池短路阈值 | VSHORT | 2 | V | 4 | |||
| BLOCK 管完全导通 | VTRON | 100 | mV | VBAT > VTRK， VTRON = VBAT - VIN | 4 | ||
| 开关频率 | FSW | 650 | K Hz | 4 | |||
| 开关 NMOS 导通阻抗 | RNFET | 60 | mΩ | 4 | |||
| EN 端关断逻辑高电平 | VENH | 0.5 | V | 4 | |||
| EN 端关断逻辑低电平 | VENL | 0.3 | V | 4 | |||
| BAT 端过压保护电压 | VOVPB | 8.9 | V | 4 | |||
| 恒流模式充电电流 | ISET | 0.85 | A | VBAT=6V; RISET = 6.8KΩ, VIN = 5V | 4 | ||
| 涓流模式充电电流 | ITC | 120 | mA | 4 | |||
| 短路模式充电电流 | IBS | 50 | mA | 4 | |||
| 终止充电电流 | ITERM | 120 | mA | 4 | |||
| 放大倍数 | AI | 5800 | AI = ICC /IISET | 4 | |||
| ISET 端恒流模式钳位电压 | VISET | 1 | V | 4 | |||
| EN 端限流阈值电压 | VEN | 1.2 | V | 4 | |||
| 热温度保护 | TSD | 165 | ℃ | 4 | |||
| 温度保护迟滞 | T | 30 | ℃ | 4 |
CAD (KiCad official)
- Symbol:
FM4258 - Footprint:
Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm - 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files:
fm4258-etched.step/fm4258-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);fm4258.step/fm4258.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Shenzhen Fuman datasheet (7 pp, sha256
b9034b1f641e3aa1, retrieved 2026-10-17, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).